A highly sensitive photoacoustic spectrometer for near infrared overtone

Lu Yuan Hao, Jia Xiang Han, Qiang Shi, Jin Hui Zhang, Jin Jin Zheng, Qing Shi Zhu

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


By optimizing the size of a photoacoustic cell for decreasing acoustic loss and noise, and using a proper multipass arrangement for increasing light power in the cell and optical coupling to the acoustic wave, a high-resolution external laser photoacoustic spectrometer with a detection sensitivity of 6.35 × 10-9 cm-1 (1:1 signal to noise level) has been developed. Using this apparatus, the high quality Doppler-limited overtone spectra of AsH3 (600) and H2Se (60) have been observed at room temperature in the wave number regions 11 500-11 650 and 12 600-12 925 cm-1, respectively. Results are presented which highlight the applicability of this apparatus to the spectroscopy of weak optical transitions.

Original languageEnglish (US)
Pages (from-to)1975-1980
Number of pages6
JournalReview of Scientific Instruments
Issue number5
StatePublished - May 2000
Externally publishedYes


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